“Once an agreement has been reached, albeit a marriage agreement, the parties thereto are expected to fulfill the obligations that they have undertaken. A party cannot simply later state that he or she did not intend to live up to his or her end of the bargain. It is true that, in some cases, agreements that appear to be fair at the time of execution may become unfair at the time of the triggering event, depending on how the lives of the parties have unfolded. It is also clear that the [British Columbia’s Family Relations Act] FRA permits a court, upon application, to find that an agreement or the statutory regime is unfair and to reapportion the assets. However, in a framework within which private parties are permitted to take personal responsibility for their financial well-being upon the dissolution of marriage, courts should be reluctant to second-guess their initiative and arrangement, particularly where independent legal advice has been obtained. They should not conclude that unfairness is proven simply by demonstrating that the marriage agreement deviates from the statutory matrimonial property regime. Fairness must first take into account what was within the realistic contemplation of the parties, what attention they gave to changes in circumstances or unrealized implications, then what are their true circumstances, and whether the discrepancy is such, given the s. 65 factors, that a different apportionment should be made.”
Hartshorne v. Hartshorne, [2004] 1 SCR 550, 2004 SCC 22 (CanLII) at 67